[release-branch.go1.1] doc: GCC 4.8.1 is not updated to Go 1.1

««« CL 9663045 / 6c64135360c2
doc: GCC 4.8.1 is not updated to Go 1.1

I will try again for 4.8.2.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/9663045
»»»

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9914045